Hi Alexandre,��
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�� as C��drick said there is no need to generate a new image from scratch.��
Pharo is basically divided in two parts an image (that is the one that it is generated by the process you want to run) and a virtual machine to run the image.��
The image is multi-OS you can download a 32 bits image and run it in any of the supported operating systems.
Usually the VM will run in different OSs, there is a VM��for�� Mac OS, one for Windows and one for Unix(es).��
The VM came in 32 and 64 bits flavors.��
You should try to run the pre built��version of the pack. And again using the Pharo Launcher will be the simpler option.
Cheers,
Pablo